3com 3C16750-US - OfficeConnect Dual Speed HUB User manual

Brand: 3com

Model: 3C16750-US - OfficeConnect Dual Speed HUB

Category: Interface hubs

Type: User manual

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Welcome to the world of networking with 3Com

In the modern business environment, communication

and sharing information are crucial. Computer

networks have proved to be one of the fastest modes

of communication. The OfficeConnect

product

range from 3Com brings the power of computer

networks to the small office.

The OfficeConnect Dual Speed Hub 8 is an

easy-to-use Class II

hub (repeater) with eight

10/100BASE-TX ports. It allows you to set up a

network with both Ethernet (10Mbps) and Fast

Ethernet (100Mbps) workstations and other devices

(a Class II hub can be connected to another Fast

Ethernet hub, a Class I hub cannot).

When referring to the OfficeConnect Dual Speed

Hub 8, this guide uses the term ‘Hub’.

Each port on the Hub can be connected to either a

10BASE-T (Ethernet) or a 100BASE-TX (Fast Ethernet)

device. The port senses the speed of the connected

equipment and operates at the appropriate speed.

If you wish to extend an existing Ethernet network

into Fast Ethernet, adding a Dual Speed Hub 8 can

offer a more cost-effective migration path than

adding both a 100Mbps hub and a 10/100Mbps

switch.

Small Network with OfficeConnect Dual Speed Hub 8

The Hub is ideal for use with other OfficeConnect

products. The OfficeConnect product range is

compact and attractively designed for desktop use,

and neatly stacks together with clips. For further

information, refer to the “OfficeConnect Product

Range

”

sheet that accompanies the Hub.

This guide helps you get the most out of your Hub.

NTRODUCTION

FFICE

ONNECT

UAL

PEED

3C16750

SER

UIDE

Part No.

DUA1675-0AAA01

Published

February 1998

FFICE

ONNECT

UAL

PEED

3C16750

SER

UIDE

Networking Terminology

Network

is a collection of workstations (for example,

IBM-compatible PCs) and other equipment (for

example, printers), connected for the purpose of

exchanging information or sharing resources.

Networks vary in size; some are within a single

room, others span continents.

Local Area Network (LAN)

is a network, usually in an

office, that spans no more than a single site.

Ethernet

is a type of LAN, referring to the technology used

to pass information around the network. It operates

at 10Mbps (megabits per second).

Fast Ethernet

is a type of LAN that runs up to 10 times

faster than standard Ethernet. It operates at

100Mbps.

10BASE-T

is the name given to the Ethernet protocol that

runs over

Twisted Pair (TP)

cable at 10Mbps.

100BASE-TX

is the name given to the Fast Ethernet protocol

that runs over

Twisted Pair (TP)

cable at 100Mbps.

Network Loop

occurs when two pieces of network

equipment are connected by more than one path.

Segment

is the length of cable connected to a port.

Packets

are the units of information your workstations and

other equipment send to each other over the

network. A

Frame

is the data part of the packet and

can be

Unicast

(sent to a single device),

Multicast

(sent to multiple devices), or

Broadcast

(sent to all

devices).

Bandwidth

refers to the amount of network traffic the

network can hold at any one time (information

capacity) measured in

bits per second (bps)

Workstations or applications that use the network

heavily are referred to as using high bandwidth (these

are usually users who do a lot of graphical or

multi-media work across the network). Fast Ethernet

has a higher bandwidth than Ethernet, so it can

cope with larger amounts of traffic, which results in

faster operation.

In a

Half Duplex

link, information can flow in either

direction, but not in both directions simultaneously.

REATING

OUR

ETWORK

Before You Start

Your OfficeConnect Dual Speed Hub 8 comes with:

One power adapter for use with the Hub

One power cord

A Warranty Registration card for you to fill out and

return

Four rubber feet

Four stacking clips

An OfficeConnect Product Range sheet

This guide

Workstation Connections

To connect workstations or other equipment (such as

servers) to your Hub, you need:

One 10BASE-T,

10/100BASE-TX, or

100BASE-TX adapter card

for each workstation.

3Com produce a range

of easy to install network

adapters, which provide

your workstation with a

suitable connection.

One suitable TP cable for each workstation.

In order to comply with the 10BASE-T standard, ports

designed for workstation connections have been

marked with the graphical symbol ‘X’. This denotes a

crossover in the port’s internal wiring, for example

1X, 2X, 3X...

You also need a network operating system running

on your workstations.

Twisted Pair (TP) Cables

To connect your workstations and other equipment to

the Hub, use ‘straight-through’ TP cables with RJ45

connectors (all OfficeConnect products use RJ45 type

connectors). A ‘straight-through’ cable is one where

each pin of one connector is connected to the same

pin of the other connector.

Cables can be shielded (screened) or unshielded; we

recommend that you use shielded cable. Cables used

for 100BASE-TX or 10/100BASE-TX connections must

be data grade (Category 5).

Your supplier should stock suitable cables.

The maximum length of a single cable is 100m

(328ft). Refer to “Fast Ethernet (100Mbps)

Configuration Rules” on page 5 for further

information on cable lengths in a 100Mbps network.

Hub Connections

To connect other OfficeConnect units to your Hub,

you need one suitable TP cable for each unit.

Using the Rubber Feet and Stacking Clips

The four self-adhesive rubber feet prevent your Hub

from sliding around on your desk. Stick the feet to

the marked areas at each corner of the underside of

your Hub.

The four stacking clips are used for neatly and

securely stacking your OfficeConnect units together.

You can stack up to four units. Small units must

be stacked above large units.

To stack your units,

secure the clips on one side and then on the other.

Use the following method to secure one side:

Place your new unit

on a flat surface.

Your clips fit in these

positions on the

side of the unit:

Position a clip over

one of these holes and

push it in until it

clicks into place.

Repeat this for the

other clip position on

the same side.

Keeping the front of

the units aligned, rest

the bottom of the

existing unit on the

clips’ spikes. Push the

clips firmly into the

existing unit until they

click into place.

Repeat these steps to secure the other side.

To remove a clip, hold the units firmly with one hand

and hook the first finger of your other hand around

the back of the clip. Use reasonable force to pull it off.

Positioning Your OfficeConnect Hub

When installing your Hub, ensure:

It is out of direct sunlight and away from sources of

heat.

Cabling is away from power lines, fluorescent lighting

fixtures, and sources of electrical noise such as radios,

transmitters and broadband amplifiers.

Water or moisture cannot enter the case of the unit.

Air flow around the unit and through the vents in the

side of the case is not restricted. We recommend you

provide a minimum of 25mm (1in.) clearance.

Wall Mounting the OfficeConnect Hub

CAUTION: Only wall mount single units. Do not wall

mount stacked units.

There are two slots on the underside of the Hub

which are used for wall mounting. You can mount

the unit with the LEDs facing upwards or downwards,

to suit your needs.

When wall mounting the unit, ensure that it is

within reach of the power outlet.

You need two suitable screws. Ensure that the wall

you are going to use is smooth, flat, dry and sturdy.

Make two screw holes which are 142mm (5.6in.)

apart. Use the guide at the top of this page to mark

the position of the holes. Fix the screws into the wall,

leaving their heads 3mm (0.12in.) clear of the wall

surface.

Remove any connections to the unit and locate it

over the screw heads. When in line, gently push the

unit on to the wall and move it downwards to

secure. When making connections, be careful not to

push the unit up and off the wall.

Connecting Workstations and Other

Equipment to Your Hub

WARNING

Ensure you have read the Important

Safety Information section carefully before you start.

ACHTUNG

Versichern Sie sich, daß Sie den Abschnitt

mit den wichtigen Sicherheitshinweisen gelesen

haben, bevor Sie das Gerät benutzen.

AVERTISSEMENT

Assurer que vous avez lu

soigneusement la section de L’information de

Sécurité Importante avant que vous commenciez.

CAUTION

The equipment connected to the Hub

must be set to operate in auto-negotiate or half

duplex mode.

Connecting workstations and other equipment to

your Hub is easy. To connect a workstation to any of

the Hub’s ports, use a ‘straight-through’ TP cable.

Refer to “Twisted Pair (TP) Cables” on page 3 for

further information.

If you are using port 8 to connect a workstation,

ensure the MDI/MDIX switch is set to MDIX (out).

TP cables are very easy to use. To connect a cable,

simply slot the connector into the appropriate RJ45

port. When the connector is fully in, its latch locks it

in place. To disconnect the cable, push the

connector’s latch in and remove it.

The Hub detects all port connections, so you can start

using your network immediately. If you need more

ports, simply add another OfficeConnect hub.

Connecting Another OfficeConnect Hub

You may wish to connect another OfficeConnect hub

to your Dual Speed Hub 8. Alternatively, you may

wish to add your Hub to an existing 10Mbps

network. When extending your network, you should

be aware of the configuration rules given below.

If you connect two Dual Speed Hub 8 units directly

together, the link between them operates at 100Mbps.

Fast Ethernet (100Mbps) Configuration Rules

The Dual Speed Hub 8 is a Class II hub. You can

connect directly two Class II Fast Ethernet hubs

(Class I Fast Ethernet hubs cannot be connected

directly to other Fast Ethernet hubs). The total length

of cable (A + B + C below) between two

workstations, or between a workstation and a

non-repeater piece of equipment (such as a switch),

must not exceed 205m (672ft). Each cable (A, B, or

C) must not exceed 100m (328ft).

3Com recommends that the cable (B) between the

Fast Ethernet hubs is no longer than 5m (16.4ft).

This allows the maximum hub-to-workstation cable

length (A or C) of 100m (328ft) to be used, as shown

in the example.

Configuration Rules and Example of a Fast Ethernet (100Mbps) Network

Ethernet (10Mbps) Configuration Rules

You can connect a maximum of four Ethernet

(10Mbps) hubs in series between workstations, or

between a workstation and a non-repeater piece of

equipment (such as a switch). Each cable must not

exceed 100m (328ft). An example is shown below.

Example of Ethernet (10Mbps) Network

Making the Connection to Another Hub

You can connect a 10BASE-T, 100BASE-TX, or

another 10/100BASE-TX OfficeConnect hub to any

port on the Dual Speed Hub 8. Use the following

method:

Using a straight-through cable, connect the

MDI/MDIX port of the Dual Speed Hub 8 to any of

the ports on the other hub (as shown in the diagram

below). If using port 8 on the other hub, set its

MDI/MDIX switch to MDIX (out).

Set the MDI/MDIX switch for the MDI/MDIX port on

the Dual Speed Hub 8 to MDI (in).

Correct Connections for OfficeConnect Hubs

Powering Up and Checking Connections

When you have connected all the appropriate

workstations and other equipment to the Hub, power

on the Hub. For each port with a connection, a Port

Status LED should be on. If the port is operating at

100Mbps, the corresponding LED in the upper row of

Port Status LEDs is on. If the port is operating at

10Mpbs, the corresponding LED in the lower row is

on. If neither LED is on, check your connections.

CAUTION

Do not power the Hub off and on quickly.

Wait about 5 seconds between power cycles.

Spot Checks

At frequent intervals, visually check that:

The Alert LED is off — this is the best way to find out

if there are problems with your network

Case vents are not obstructed

Cabling is secure and not pulled taut

If you suspect a problem, refer to “Problem Solving”

on page 7.

3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California, 95052-8145, U.S.A.

© 3Com Technologies, 1998. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without

permission from 3Com Technologies. 3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide

notification of such revision or change. 3Com Technologies provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness

for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following restricted rights:

For units of the Department of Defense: Restricted Rights Legend:

Use, duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for restricted Rights in Technical Data and

Computer Software clause at 48 C.F.R. 52.227-7013. 3Com Centre, Boundary Way, Maylands Park South, Hemel Hempstead, Herts, HP2 7YU, U.K.

For civilian agencies: Restricted Rights Legend:

Use, reproduction or disclosure is subject to restrictions set forth in subparagraph (a) through (d) of the Commercial Computer Software - Restricted Rights Clause at 48 C.F.R.

52.227-19 and the limitations set forth in 3Com Corporation’s standard commercial agreement for the software. Unpublished rights reserved under the copyright laws of the United States.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document,

in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com and OfficeConnect are registered trademarks of 3Com Corporation. Other brand and product names may be registered trademarks or trademarks of their respective holders.

MPORTANT

AFETY

NFORMATION

ICHTIGE

ICHERHEITSHINWEISE

L’

INFORMATION

ÉCURITÉ

MPORTANTE

WARNING

Warnings contain directions that you must follow for your

personal safety. Follow all instructions carefully.

Please read the following information carefully before installing the

OfficeConnect unit:

Exceptional care must be taken during installation and removal of the unit.

Only stack the OfficeConnect unit with other OfficeConnect units.

Only use the power adapter that is supplied with the unit to ensure

compliance with international safety standards.

It is essential that the power outlet is located near the unit and is accessible.

You can only remove power to the OfficeConnect unit by disconnecting the

power adapter from the unit or from the socket outlet.

This unit operates under SELV conditions (Safety Extra Low Voltage) according

to IEC 950, the conditions of which are maintained only if the equipment to

which it is connected is also operational under SELV.

There are no user-replaceable fuses or user-serviceable parts inside the unit. If

you have a physical problem with the unit that cannot be solved with problem

solving actions in this guide, contact your supplier.

Disconnect the power adapter before moving the unit.

WARNING: Twisted Pair RJ45 ports.

These are RJ45 data sockets. They

cannot be used as telephone sockets. Only connect RJ45 data connectors to

these sockets.

Power Cord Set:

This must be approved for the country where it is used:

USA and

Canada

The cord set must be UL-approved and CSA certified.

The minimum specification for the flexible cord is:

No. 18 AWG

Type SV or SJ

3-conductor

The cord set must have a rated current capacity of at least

10A.

The attachment plug must be an earth-grounding type

with a NEMA 5-15P (15A, 125V) or NEMA 6-15P (15A,

250V) configuration.

Denmark The supply plug must comply with section 107-2-D1,

standard DK2-1a or DK2-5a.

Switzerland The supply plug must comply with SEV/ASE 1011.

ACHTUNG:

Die Warnungen enthalten Anweisungen, die Sie zur eigenen

Sicherheit zu befolgen haben.

Lesen Sie bitte die folgenden Informationen sorgfältig durch, bevor Sie das

Gerät

einbauen:

Auf besondere Vorsicht muß während des Ein- und Ausbaus des Gerätes

geachtet werden.

Stapeln Sie das Gerät nur mit anderen OfficeConnect Gerätes zusammen.

Verwenden Sie nur das mit dem Gerät mitgelieferte Netzteil um die

internationalen Sicherheitsstandards zu erfüllen.

Die Netzsteckdose muß sich in unmittelbarer Nähe des Gerätes befinden und

frei zugänglich sein. Sie können das Gerät nur spannungsfrei schalten, indem

Sie das Steckernetzteil aus der Netzsteckdose ziehen oder die Verbindung zum

Gerät unterbrechen.

Dieses Gerät arbeitet mit SELV-Spannung (Safety Extra Low Voltage,

Sicherheitskleinspannung) gemäß IEC950. Diese Bedingungen werden nur

eingehalten, wenn die Geräte mit denen des Gerätes verbunden ist ebenfalls

mit SELV-Spannung arbeiten.

Es sind keine von dem Benutzer zu ersetzende oder zu wartende Teile in dem

Gerät vorhanden. Wenn Sie ein Problem mit dem Gerät haben, das nicht

mittels der Fehleranalyse in dieser Anleitung behoben werden kann, setzen Sie

sich mit Ihrem Lieferanten in Verbindung.

Bevor das Gerät ausgebaut wird ist das Netzteil zu ziehen.

ACHTUNG: Gedrehte paarfache RJ45 Anschlüsse.

Es sind RJ45

Datenanschlußbuchsen. Sie dürfen nicht als Telefonanschluß verwendet

werden. Verbinden Sie nur RJ45 Datenstecker mit diesen Anschlüssen.

AVERTISSEMENT:

Les avertissements contiennent les instructions que vous

devez suivre pour votre sécurité personnelle. Suivre toutes les instructions avec

soin.

Veuillez lire à fond l’information suivante avant d’installer l’appareil:

Le soin exceptionnel doit être pris pendant l’installation et l’enlèvement de

l’appareil.

Seulement entasser l’appareil avec les autres appareils OfficeConnect.

Seulement utiliser la pièce de raccordement d’alimentation qui est fournie avec

l’appareil pour assurer la conformité avec les normes de sécurité

internationales.

C’est essentiel que le socle de prise de courant du réseau soit localisé proche

de l’appareil et soit accessible. Vous pouvez seulement enlever l’alimentation

de l’appareil en débranchant la pièce de raccordement d’alimentation de

l’unité ou du socle de prise de courant.

Cet appareil fonctionne sous les conditiones SELV (Sécurité du Voltage le plus

Bas) d’après IEC950, les conditions desquelles sont maintenues seulement si le

matériel à qui il est branché est aussi en exploitation sous SELV.

Il n’y a pas de parties remplaceables par les utilisateurs ou entretenues par les

utilisateurs à l’intérieur de l’appareil. Si vous avez un problème physique avec

l’appareil qui ne peut pas être résolu avec les actions de la résolution des

problèmes dans ce guide, contacter votre fournisseur.

Débrancher la pièce de raccordement d’alimentation avant de remuer

l’appareil.

AVERTISSEMENT: Les ports RJ45 de paire torsadée.

Ceux-ci sont les socles

de données RJ45. Ils ne peuvent pas être utilisés comme socles de téléphone.

Seulement brancher les connecteurs de données RJ45 à ces socles.

Cordon électrique:

Il doit être agréé dans le pays d'utilisation:

Etats-Unis et

Canada

Le cordon doit avoir reçu l'homologation des UL et un

certificat de la CSA.

Le cordon souple doit respecter, à titre minimum, les

spécifications suivantes:

calibre 18 AWG

type SV ou 5J

à 3 conducteurs

Le cordon doit être en mesure d'acheminer un courant

nominal d'au moins 10 A.

La prise femelle de branchement doit être du type à mise à

la terre (mise à la masse) et respecter la configuration

NEMA 5-15P (15 A, 125 V) ou NEMA 6-15P (15 A, 250 V).

ROBLEM

OLVING

The Hub has been designed to aid you when

detecting and solving possible problems with your

network. These problems are rarely serious; the

cause is usually a disconnected or damaged cable, or

incorrect configuration. If this section does not solve

your problem, contact your supplier for information

on what to do next.

Perform these actions first:

Ensure all network equipment is powered on.

Power each piece of network equipment off, wait

about 5 seconds and then power each one on.

Check the following symptoms and solutions:

Power LED not lit.

Check your power adapter

connection. If there is still no power, you may have a

faulty power adapter which needs replacing with an

identical OfficeConnect power adapter.

Do not use

any other power adapter with the Hub.

Port Status LED not lit for a port that has a

connection.

Check that you are using a

‘straight-through’ cable which is properly connected

at both ends, and is not damaged. Refer to “Twisted

Pair (TP) Cables” on page 3. Also check that the

equipment connected to the Hub is powered on,

operating correctly and contains the correct type of

connection.

10Mbps Port Status LED lit for a port with a

100Mbps device connected.

This may be because

the cable is not of a high enough quality to carry Fast

Ethernet signals (we recommend you use a

Category 5 cable), or due to a problem with the

network card (NIC) of the attached equipment.

Port Status LED flashing.

The port is partitioned,

probably due to a network loop. Examine your

connections and remove the loop. Each piece of

equipment needs only one connection to your Hub.

Link between the Hub and another

OfficeConnect hub not working.

Check your

connections; follow the information given in the

“Connecting Another OfficeConnect Hub” section

on page 5. It is likely that an MDI/MDIX switch is

incorrectly set.

Alert LED continuously lit.

There is a problem with

the network. Check the Port Status LEDs to try to

identify the port that is causing the problem. If one

of the Port Status LEDs is flashing, that port has

partitioned, probably due to a network loop.

Examine your connections and remove the loop.

Each piece of equipment needs only one connection

to your Hub.

If you cannot identify such a port, remove the port

connections one at a time, waiting a few seconds

between each port. If the Alert LED goes off, there is

either a network loop (see above), or an excessive

amount of traffic on that port connection. Check the

Network Utilization LEDs to see if the network is

heavily loaded (over 80%). Some pieces of network

equipment operate by sending out frames regularly.

Refer to the documentation that accompanies the

piece of network equipment.

If the Alert LED is still lit after removing all of your

connections, there may be a problem with your Hub.

Power it off, wait about 5 seconds and then power

it on. If the Alert LED comes back on continuously,

contact your supplier.

Dimensions and Operating Conditions

OfficeConnect Dual Speed Hub 8

Standards

Functional: ISO 8802/3

IEEE 802.3, 802.3u

Safety: UL 1950, EN 60950

CSA 22.2 #950, IEC 950

Emissions: EN 55022 Class B*

FCC Part 15 Class B*

ICES-003 Class B*

VCCI Class B*

AS/NZS 3548 Class B*

EN50082-1

* Screened (shielded) cables must be used to ensure

compliance with these EMC standards. Refer to “EMC

Statements” on page 8 for conditions of operation.

Environmental: EN 60068 (IEC 68)

Acoustic Noise: ISO 7779

ISO 9295

IMENSIONS

AND

TANDARDS

The duration of the warranty for the OfficeConnect Dual Speed Hub 8 (3C16750) is

lifetime, including the power adapter.

Advance hardware exchange is available during the first year from your date of purchase

in accordance with 3Com’s standard terms and conditions for such service. After the first

year, the warranty reverts to 3Com’s standard lifetime limited warranty.

To qualify for the lifetime limited warranty and the advance hardware exchange, you must

submit the appropriate product warranty registration card to 3Com, otherwise this

product will be warranted for a period of one (1) year without advance hardware

exchange.

HARDWARE:

3Com warrants its hardware products to be free from defects in

workmanship and materials, under normal use and service, for the following lengths of

time from the date of purchase from 3Com or its Authorized Reseller:

Network adapters

Lifetime

Other hardware products

One year (unless otherwise specified above)

Spare parts and spares kits

90 days

If a product does not operate as warranted above during the applicable warranty period,

3Com shall, at its option and expense, repair the defective product or part, deliver to

Customer an equivalent product or part to replace the defective item, or refund to

Customer the purchase price paid for the defective product. All products that are

replaced will become the property of 3Com. Replacement products may be new or

reconditioned. Any replaced or repaired product or part has a ninety (90) day warranty or

the remainder of the initial warranty period, whichever is longer.

3Com shall not be responsible for any software, firmware, information, or memory data of

Customer contained in, stored on, or integrated with any products returned to 3Com for

repair, whether under warranty or not.

SOFTWARE:

3Com warrants that the software programs licensed from it will perform in

substantial conformance to the program specifications therefor for a period of ninety (90)

days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the

media containing software against failure during the warranty period. No updates are

provided. 3Com's sole obligation with respect to this express warranty shall be (at

3Com's discretion) to refund the purchase price paid by Customer for any defective

software products, or to replace any defective media with software which substantially

conforms to 3Com's applicable published specifications. Customer assumes responsibility

for the selection of the appropriate applications program and associated reference

materials. 3Com makes no warranty or representation that its software products will

work in combination with any hardware or applications software products provided by

third parties, that the operation of the software products will be uninterrupted or error

free, or that all defects in the software products will be corrected. For any third party

products listed in the 3Com software product documentation or specifications as being

compatible, 3Com will make reasonable efforts to provide compatibility, except where the

non-compatibility is caused by a "bug" or defect in the third party's product.

STANDARD WARRANTY SERVICE:

Standard warranty service for hardware products

may be obtained by delivering the defective product, accompanied by a copy of the dated

proof of purchase, to 3Com's Corporate Service Center or to an Authorized 3Com Service

Center during the applicable warranty period. Standard warranty service for software

products may be obtained by telephoning 3Com's Corporate Service Center or an

Authorized 3Com Service Center, within the warranty period. Products returned to

3Com's Corporate Service Center must be pre-authorized by 3Com with a Return Material

Authorization (RMA) number marked on the outside of the package, and sent prepaid,

insured, and packaged appropriately for safe shipment. The repaired or replaced item will

be shipped to Customer, at 3Com's expense, not later than thirty (30) days after receipt of

the defective product by 3Com.

WARRANTIES EXCLUSIVE:

IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED

ABOVE, CUSTOMER'S SOLE REMEDY FOR BREACH OF THAT WARRANTY SHALL BE

REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM'S

OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND

REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR

CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW,

STATUTORY OR OTHERWISE, INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND SATISFACTORY

QUALITY. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME

FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION,

MAINTENANCE OR USE OF ITS PRODUCTS.

3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION

DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS

CAUSED BY CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER

INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR OR MODIFY, OR ANY

OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE,

LIGHTNING, OR OTHER HAZARD.

LIMITATION OF LIABILITY.

TO THE FULL EXTENT ALLOWED BY LAW 3COM ALSO

EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT

OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT,

SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS,

LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS

ARISING OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE,

USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR

ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES,

AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE

PRICE PAID, AT 3COM'S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL

NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL

PURPOSE.

Some countries, states, or provinces do not allow the exclusion or limitation of implied

warranties or the limitation of incidental or consequential damages for certain products

supplied to consumers or the limitation of liability for personal injury, so the above

limitations and exclusions may be limited in their application to you. This warranty gives

you specific legal rights which may vary depending on local law.

GOVERNING LAW:

This Limited Warranty shall be governed by the laws of the state of

California.

3Com Corporation

, 5400 Bayfront Plaza, Santa Clara, CA, 95052-8145, U.S.A.

Tel: (408) 764-5000

9/1/96

FCC STATEMENT:

This equipment has been tested and found

to comply with the limits for a Class B digital device, pursuant

to part 15 of the FCC rules. These limits are designed to

provide reasonable protection against harmful interference in a

residential installation. This equipment generates, uses and can

radiate radio frequency energy and, if not installed and used in

accordance with the instructions, may cause harmful

interference to radio communications. However, there is no

guarantee that interference will not occur in a particular

installation. If this equipment does cause harmful interference

to radio or television reception, which can be determined by

turning the equipment off and on, the user is encouraged to try

to correct the interference by one or more of the following

measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and the receiver.

Connect the equipment into an outlet on a circuit different from

that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

CSA STATEMENT:

This Class B digital apparatus meets all

requirements of the Canadian Interference-Causing Equipment

Regulations.

Cet appareil numérique de la classe B respecte toutes les

exigences du Règlement sur le matériel brouilleur du Canada.

The user may find the following booklet prepared by the

Federal Communications Commission helpful:

‘ How to Identify and Resolve Radio-TV Interference Problems’

This booklet is available from the U.S. Government Printing

Office, Washington, DC 20402, Stock No. 004-000-00345-4.

In order to meet FCC emissions limits, this equipment must be

used only with cables which comply with IEEE 802.3.

EMC S

TATEMENTS

IFETIME

IMITED

ARRANTY

Year 2000 Compliance:

For information on Year 2000 compliance and 3Com products, visit the 3Com Year 2000 Web page:

http://www.3com.com/products/yr2000.html

Environmental Statement:

Please recycle this user guide after use.

Please e-mail any comments about this document to 3Com at:

pddtechpubs_comments@3Com.com.

Please include the following information:

the document title (OfficeConnect Dual Speed Hub 8 User Guide), part number (DUA1675-0AAA01) and, if appropriate, the page number.

3com 3C16750-US - OfficeConnect Dual Speed HUB User manual

Brand: 3com

Model: 3C16750-US - OfficeConnect Dual Speed HUB

Category: Interface hubs

Type: User manual

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